US20160065919A1 - Light source apparatus and projector having light source apparatus - Google Patents
Light source apparatus and projector having light source apparatus Download PDFInfo
- Publication number
- US20160065919A1 US20160065919A1 US14/838,466 US201514838466A US2016065919A1 US 20160065919 A1 US20160065919 A1 US 20160065919A1 US 201514838466 A US201514838466 A US 201514838466A US 2016065919 A1 US2016065919 A1 US 2016065919A1
- Authority
- US
- United States
- Prior art keywords
- light
- light source
- housings
- source apparatus
- phosphor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 144
- 230000003287 optical effect Effects 0.000 claims abstract description 54
- 230000017525 heat dissipation Effects 0.000 claims description 32
- 238000010586 diagram Methods 0.000 description 10
- 230000015556 catabolic process Effects 0.000 description 9
- 238000006731 degradation reaction Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005284 excitation Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229910052594 sapphire Inorganic materials 0.000 description 1
- 239000010980 sapphire Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/007—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light
- G02B26/008—Optical devices or arrangements for the control of light using movable or deformable optical elements the movable or deformable optical element controlling the colour, i.e. a spectral characteristic, of the light in the form of devices for effecting sequential colour changes, e.g. colour wheels
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2046—Positional adjustment of light sources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3158—Modulator illumination systems for controlling the spectrum
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
Definitions
- the disclosure relates to a light source apparatus and a projector having the light source apparatus.
- the time divisional type projector emits lights of a plurality of wavelengths and forms images by modulating the emitted lights of the plurality of wavelengths sequentially, and then projects the formed images.
- a light source apparatus used for the time divisional type projector for example, there is known a light source apparatus having a light source that outputs a white light, and a rotating wheel to which a plurality of color filters are attached. According to such light source apparatus, the light source emits the white light to the rotating wheel which rotates at constant speed, and thereby emitting lights of a plurality of wavelengths (such as blue, green and red lights) in a time divisional manner.
- a light source apparatus including a light source that outputs a light of a single wavelength, such as a laser diode, and a rotating wheel having phosphor layers instead of color filters.
- the light source emits the light of a single wavelength to the rotating wheel which rotates at constant speed, and thereby emitting lights of a plurality of wavelengths in a time divisional manner. For example, it is possible to convert wavelength of a blue light from a laser diode into that of a green or red light by using phosphors.
- JP 2011-133782 A there is proposed a method to enlarge an approximately oval shape of a light which is emitted from a laser light source and condensed onto the phosphors by installing the laser light source rotated around its optical axis, and thereby making uniform brightness for projecting.
- JP 2012-215633 A there is proposed a method to change a position of the light condensed position of each laser light source on the phosphor by varying distances of the plurality of laser light sources and distances of collimator lenses located at the output side of the laser light sources, and thereby exciting the phosphors with a low light intensity.
- the rotating direction of each laser diode needs to be adjusted in the case of rotating the laser diode around the optical axis. Further, since a light emitted from each laser light source is condensed onto the same position, the light intensity at the light condensed point may be so high that the emission efficiency of phosphor is reduced. According to the light source apparatus described in JP 2012-215633, a position of a light condensed position of each laser light source can be changed. However, as a diameter of the light condensed position formed by a parallel light from the collimator lens is small, the light intensity of a parallel light from the collimator lens is high, so that the emission efficiency of phosphor may be reduced.
- One aspect of the light source apparatus according to the present invention is a light source apparatus comprising:
- a plurality of light sources each including a laser diode and a collimating lens, said collimating lens making a light emitted from said laser diode into an approximately collimated beam
- a condenser lens which condenses lights emitted from said plurality of housings to a phosphor
- a phosphor wheel having said phosphor, said phosphor wheel transmitting a light which is emitted from said condenser lens
- incident angles of the lights emitted from said housings to an optical axis of said condenser lens are made different by varying mount angles of said housings to a supporting member.
- One aspect of the projector according to the present invention is a projector comprising:
- a light modulating device which modulates lights emitted from the light source apparatus in the plurality of wavelength ranges to form an image based on an image data
- a projecting device which enlarges and projects the images.
- FIG. 1 A illustrates a schematic diagram of a light source apparatus
- FIG. 1 B illustrates an explanatory diagram of an optical axis for describing a light source apparatus according to one embodiment of the present invention.
- FIGS. 2A to 2C illustrate a schematic diagram for describing a light source apparatus according to a first embodiment of the present invention, in which mounted surfaces of the housings are slanted.
- FIGS. 3A to 3C illustrate a figure for describing a shape and a light intensity distribution (sectional light intensity) of the light condensed position in the first embodiment.
- FIGS. 4A to 4D illustrate a schematic diagram for describing a light source apparatus according to a second embodiment of the present invention in which positions of the collimating lenses are shifted, and a figure for describing a shape and a light intensity distribution (sectional light intensity) of the light condensed position.
- FIGS. 5A to 5B illustrates a schematic diagram for describing a phosphor wheel according to one embodiment of the present invention.
- FIG. 6 illustrates a graph for describing a light intensity of the phosphor in the case of combining the first and second embodiments and a light intensity of the phosphor in other cases.
- FIG. 7 illustrates a schematic diagram for describing a configuration of a projector according to one embodiment of the invention, which includes the above mentioned light source apparatus.
- the light source apparatus is a light source apparatus comprising:
- a plurality of light sources each including a laser diode and a collimating lens, said collimating lens making a light emitted from said laser diode into an approximately collimated beam
- a condenser lens which condenses lights emitted from said plurality of housings to a phosphor
- a phosphor wheel having said phosphor, said phosphor wheel transmitting a light which is emitted from said condenser lens
- incident angles of the lights emitted from said housings to an optical axis of said condenser lens are made different by varying mount angles of said housings to a supporting member.
- lights emitted from the plurality of housings are condensed onto different positions on the phosphor wheel (that is “on the phosphor”) by the condenser lens. Therefore, a light intensity at the light condensed position on the phosphor can be lowered, so that a light which is emitted from the phosphor can be used efficiently.
- the light source apparatus can be manufactured without lowering the productivity.
- the light source apparatus which can suppress degradation of the emission efficiency of phosphor as much as possible, and can be manufactured without lowering the productivity with achieving simple assembly.
- the light source apparatus according to Aspect 2 of the present invention is the light source apparatus according to the above mentioned Aspect 1,
- a location of said collimating lens to said laser diode is shifted from a position of said collimating lens to emit a collimated light.
- each light source since a light which is emitted from the collimating lens becomes different from the parallel light by shifting the location of the collimating lens with respect to the laser diode, a diameter of the light condensed position on the phosphor can be enlarged, while a shift of the location of the light condensed positions formed by the lights from the plurality of the laser diodes can be made smaller.
- the light source apparatus according to Aspect 3 of the present invention is the light source apparatus according to the above mentioned Aspect 1 or 2,
- said light sources are aligned in a short axis of a far field pattern of said laser diode, and the mount angles of said housings are varied in the direction of rotating around a long axis of a far field pattern of said laser diode.
- each of the light sources is aligned in the short axis of the far field pattern of the laser diode, and the mount angles of the housings are varied in the direction of rotating around the long axis of the far field pattern of the laser diode, a light emitted from each light source can be prevented from interfering with each other, and thus the light density at the light condensed position can be lowered adequately.
- the light source apparatus according to Aspect 4 of the present invention is the light source apparatus according to any one of the above mentioned Aspects 1 to 3,
- housings are mounted on the same supporting member, and mounted surfaces of said housings to said supporting member are slanted.
- the light source apparatus according to Aspect 5 of the present invention is the light source apparatus according to the above mentioned Aspect 4,
- fixing the housings having slanted mounted surfaces and having the same shape with each other to the supporting member so as to rotate by 180 degrees to each other, allows the incident angle of the light which is emitted from each housing with respect to an optical axis of the condenser lens to be made different. Therefore, it can certainly lower a light density at the light condensed position by using very simple configuration.
- the light source apparatus according to Aspect 6 of the present invention is the light source apparatus according to the above mentioned Aspects 4,
- fixing the housings having slanted mounted surfaces and having the same shape with each other to the supporting member so as to rotate by 90 degrees to others, allows the incident angle of the light emitted from each housing to an optical axis of the condenser lens to be made different. Therefore, it can certainly lower the light density at the light condensed position by using very simple configuration.
- the light source apparatus according to Aspect 7 of the present invention is the light source apparatus according to any one of the above mentioned Aspects 1 to 3,
- housings are mounted on the same supporting member, and a mounting surface of said supporting member on which said housings are mounted is slanted.
- the incident angle of the light emitted from each housing to an optical axis of the condenser lens is made different. Therefore, once the supporting member is formed having the slanted mounting surface, a shape of the housing can be simplified so that the housing can be replaced easily with a low cost in the time of maintenance or the like.
- the light source apparatus according to Aspect 8 of the present invention is the light source apparatus according to any one of the above mentioned Aspects 4 to 7,
- the slant angle of the mounted surface of said housing or the mounting surface of said supporting member is in a range from 0.25 to 2 degrees.
- the slant angle ranges from 0.25 to 2 degrees, the degradation of the emission efficiency of phosphor can be suppressed without enlarging the area of the light condensed position so much.
- the light source apparatus according to Aspect 9 of the present invention is the light source apparatus according to any one of the above mentioned Aspects 1 to 8,
- the supporting member works as a heat dissipation member.
- the supporting member works as a heat dissipation member, the housing can be cooled efficiently, and downsizing of the light source apparatus with reducing the number of components can be facilitated.
- the light source apparatus according to Aspect 10 of the present invention is the light source apparatus according to any one of the above mentioned Aspects 1 to 9,
- one of said phosphors is a phosphor which emits a light including a red light.
- the light source apparatus according to Aspect 11 of the present invention is the light source apparatus according to any one of the above mentioned Aspects 1 to 10,
- wavelength of lights emitted from said housings is in a range from 370 to 500 nm.
- the projector according to Aspect 1 of the present invention is a projector comprising:
- the light source apparatus according to any one of Aspects 1 to 11 of the light source apparatus,
- a light modulating device configured to modulates lights which are emitted from the light source apparatus in the plurality of wavelength ranges to form an image based on an image data
- a projecting device which enlarges and projects the images.
- FIG. 1A illustrates a schematic diagram of the light source apparatus
- FIG. 1B illustrates an explanatory diagram of a short axis and a long axis of a far field pattern of said laser diode (a sectional view seeing from Arrow A-A) for describing the light source apparatus according to one embodiment of the present invention.
- the light source apparatus 1 includes housings 10 which act as a light source position, a condenser lens 20 , a phosphor wheel 30 , a receiving lens 40 , a rotary driving apparatus 50 and a heat dissipation plate 60 .
- blue lights are emitted from the housings 10 , and the emitted blue lights enter the condenser lens 20 .
- the lights are converted by the converting lens 20 (details are described later), and then enters the phosphor wheel 30 which is rotated by the rotary driving apparatus 50 .
- the phosphor wheel 30 is formed by a material which transmits a light.
- a dielectric film 31 is formed on a light-incident surface of the phosphor wheel 30 concentrically, and a phosphor 32 is formed on light-emitting surface of the phosphor wheel 30 concentrically.
- a green phosphor region, a red phosphor region and a blue-light transmissive region are formed on the light-emission surface of the phosphor wheel 30 concentrically.
- the green phosphor emits a green light when a blue light enters the green phosphor
- the red phosphor emits a red light when a blue light enters the red phosphor. Therefore, when a blue light from the condenser lens 20 enters the phosphor wheel 30 , a green light, a red light and a blue light is emitted from the phosphor wheel 30 in a time divisional manner, and enter the receiving lens 40 . Then, the light is condensed by the receiving lens 40 , and is outputted from the light source apparatus 1 .
- a wavelength of the emitted lights of the laser diodes 12 used in this embodiment is preferably in a range from 370 to 500 nm, and more preferably from 420 to 500 nm.
- the plurality of housings 10 are fixed to a mounting surface of the heat dissipation plate 60 which is a supporting member.
- one housing 10 is illustrated in a solid line and another housing 10 is illustrated in a dotted line.
- Each of the housings 10 is configured such that a plurality of laser diodes 12 which emit blue lights, and a plurality of collimating lenses 13 which make lights emitted from the laser diode 12 into approximately parallel lights are placed in a main body 11 of the housing 10 .
- the laser diodes 12 and the collimating lenses 13 are arranged such that a light is emitted from each of the laser diodes 12 in approximately parallel in the same direction.
- Each housing 10 is fixed to the heat dissipation plate (supporting member) 60 with varying a mount angle of each housing 10 with respect to the heat dissipation plate 60 (Refer to the housing 10 of the solid line and the housing 10 of the dotted line comparatively). Therefore, an optical axis 14 of the light which is emitted from each housing 10 is not parallel to an optical axis 21 of the condenser lens 20 , and thus the light from each housing 10 enters the condenser lens 20 with a different incident angle respectively. Accordingly, as illustrated by the solid line and the dotted line in FIG.
- the light from each housing 10 is condensed onto different positions on the phosphor wheel 30 respectively.
- FIG. 1 although it is illustrated such that the light is condensed onto a surface of the dielectric film 31 formed on the light-incident surface of the phosphor wheel 30 , it is possible to describe “the light is condensed onto different positions on the phosphor 32 ” because the dielectric film 31 is very thin and the light is not condensed nor diffused on the phosphor wheel 30 .
- the dielectric film 31 is formed on the light-incident surface of the phosphor wheel 30
- the phosphor 32 is formed on the light-emission surface of the phosphor wheel 30 concentrically with the phosphor wheel 30 .
- FIG. 5 a phosphor wheel according to one embodiment is illustrated schematically.
- FIG. 5 A illustrates the light-incident surface of the phosphor wheel 30
- FIG. 5 B illustrates the light-emission surface of the phosphor wheel 30 .
- the green phosphor region, the red phosphor region and the blue-light transmissive region are formed on the phosphor wheel 30 .
- the dielectric film 31 G which transmits a blue light and reflects a green light is formed on the light-incident surface side.
- a green phosphor 32 G which has a green light wavelength range is formed on the light-emission surface side.
- the dielectric film 31 R which transmits a blue light and reflects a red light is formed on the light-incident surface side, and a red phosphor 32 R which has a red light wavelength range is formed on the light-emission surface side.
- the dielectric film 31 B which transmits a blue light is formed on the light-incident surface side, and no phosphor is formed on the light emission surface side.
- the dielectric film 31 B which transmits a blue light may be formed on the light-emission surface side as well as on the incident surface side.
- a light-scattering member such as a particle of SiO 2 , TiO 2 , Ba 2 So 4 or the like is preferably formed thereon in order to improve luminance unevenness and color unevenness.
- the dielectric films 31 G and 31 R formed on the green phosphor region and red phosphor region respectively transmit a blue light and reflects a light of the wavelength corresponding to the color of respective region. Accordingly, a light emitted from the phosphors 32 G and 32 R in the direction toward the laser diode 12 can be reflected back toward the receiving lens 30 by the dielectric films 31 G and 31 R, so that the phosphor can be used efficiently.
- the phosphor 32 G which is coated on the green phosphor region of the phosphor wheel 30 preferably emits a green light including the wavelength range of 500 to 560 nm.
- Specific examples of the materials of the phosphor 32 G are ⁇ -Si 6-Z : Al Z O Z N 8-Z : Eu, Lu 3 Al 5 O 12 : Ce, Ca 8 MgSi 4 O 16 C 12 : Eu, Ba 3 Si 6 O 12 N 2 : Eu, (Sr, Ba, Ca)Si 2 O 2 N 2 : Eu.
- the phosphor 32 R which is coated on the red phosphor region of the phosphor wheel 30 preferably emits a red light including the wavelength range of 600 to 800 nm.
- Specific examples of the materials of the phosphor 32 R are (Sr, Ca) AlSiN 3 : Eu, CaAlSiN 3 : Eu, SrAlSiN 3 : Eu, K 2 SiN 6 : Mn.
- the ratio among the green phosphor region, the red phosphor region and the blue-light transmissive region on the phosphor wheel 30 can appropriately be determined.
- the ratio can be calculated according to the chromaticity of a white light required for a projector and the efficiency of each phosphor or the like.
- each of the green phosphor and the red phosphor region has an angle of 150 degrees
- the blue-light transmissive region has an angle of 60 degrees.
- the phosphor wheel 30 has three regions which are for green, red and blue lights, it can have four regions or more. For example, a white light region with blue and yellow light may be further provided. The number of regions for green, red and blue lights can be increased respectively and 2 positions for each color.
- the phosphor wheel 30 is made of a transparent circular plate which transmits a light, and a center of the phosphor wheel 30 is fixed to the rotating axis 50 a of the rotary driving apparatus 50 .
- a material of the phosphor wheel 30 any material having a high light-transmittance, such as glass, resin, sapphire or the like can be used.
- a position indicated by “SP” shows the position to which a light emitted from the hosing 10 is condensed by the condenser lens 20 (the light condensed position).
- the position indicated by “FL” shows the position in which the phosphor layer emits when a light is projected from the housing 10 (the phosphor position).
- the rotary driving apparatus 50 is a brushless DC motor, and placed such that the rotating axis 50 a thereof and the optical axis 21 a of the condenser lens 20 are located in parallel. Further, the rotary driving apparatus 50 is fixed such that the surface of the phosphor wheel 30 is located perpendicularly to the rotating axis 50 a .
- a rotating speed of the rotary driving apparatus 50 is a rotating speed according to a frame rate of moving images (the number of frames per second, a unit [fps]) to be played. For example, in the case where moving images are played at 60 [fps], a rotating speed of the rotary driving apparatus 50 (that is, the phosphor wheel 30 ) should be determined as integer multiples of 60 rounds per second.
- a light which is emitted from the phosphor wheel 30 is condensed by the receiving lens 40 and is outputted from the light source apparatus 1 .
- the light source apparatus is used for a light source for the projector
- a light outputted by the light source apparatus 1 is condensed onto a light modulating device, and the image formed by the light modulating device is enlarged and projected by a projecting device.
- An etendue which is calculated according to the relationship between the image size formed by the light modulating device and the projecting angle of the light projected by the projecting device is affected by “NA” of the receiving lens 40 and the size of emitting area of the phosphor.
- the phosphor since the phosphor emits a light in approximately Lambertian distribution, it is desirable that the light-receiving lens 40 should have higher NA, and the phosphor position FL should be small. If the etendue of the phosphor side is higher than the etendue of the projecting device side, the difference causes reduction of the efficiency.
- the phosphor position FL should be as small as possible. In this case, however, a light density of a light from housing 10 may become high.
- the size of the phosphor position FL is preferably around 2 mm, it is preferable that the size of the light condensed position SP should be 2 mm or less. This size is not a size of the light condensed position of a light from each housing 10 , but total area of the light condensed positions on the condition that the plurality of housings 10 are fixed.
- the description of the housing includes a description of a first embodiment and a description of a second embodiment.
- incident angles of the lights which is emitted from the housings 10 to the optical axis of the condenser lens 20 are made different by varying a mount angle of each housing 10 with respect to the heat dissipation plate (supporting member) 60 .
- a location of the collimating lens 13 to the laser diode 12 is shifted from the position of the collimating lens 13 (focusing position) to emit a collimated light.
- the first embodiment of the present invention relating to the housing is described with referring to FIGS. 1 to 3 .
- the laser diodes 12 are aligned in a short axis (X axis) of a far field pattern of a diffused light emitted from the laser diode 12 , and the mount angle of the housing 10 is varied by rotating around a long axis (Y axis) of a far field pattern of the laser diode 12 .
- the vertical direction in the drawing corresponds to Y axis direction.
- FIG. 1B In an explanatory diagram of axis (refer to FIG. 1B ) which is seen from the arrow A-A in FIG. 1A , the short axis (X axis) and the long axis (Y axis) in the far field pattern are illustrated.
- FIG. 1A four light sources (pairs of the laser diode 12 and the collimating lens 13 ) are aligned in the short axis (X axis) in one line.
- the number of the line not limited thereto, and it is possible to have a configuration having two lines where four light sources are aligned in the short axis (X axis) respectively, and further a configuration having 3 lines or more is also possible.
- the mount angle of the housing 10 is changed as rotating around the long axis (Y axis) from the direction that a light emits from the housing 10 in parallel to the optical axis of the condenser lens 20 . Therefore, the light which is emitted from the housing 10 enters the condenser lens 20 with an incident angle corresponding to the mount angle (slanted angle). Thus, the light enters the condenser lens 20 with the angle corresponds to the mount angle (slanted angle) with respect to the optical axis 21 .
- the mount angle (slanted angle) that is, the incident angle (the angle with respect to the optical axis of the condenser lens 20 ) 0.25 to 2 degrees are preferable as absolute values.
- FIG. 2A illustrates two housings 10 which respectively have two lines of light sources in which four light sources are aligned in the short axis (X axis which extends up and down direction in the drawing).
- Such two housings 10 are placed being adjacent to each other (refer to M and N), and the two housings 10 indicated by M and N are mounted on the heat dissipation plate 60 without being inclined.
- the housing 10 has a rectangular side shape, and the mounted surface and the light-emitting surface of the housing 10 is arranged in parallel to the mounting surface of the heat dissipation plate 60 .
- a condensed shape (refer to M′ and N′′) of the light condensed position SP of the light condensed by the condenser lens 20 and a light intensity distribution (sectional light intensity) of the light condensed position SP are shown by a shape and a graph in FIG. 3A .
- the condensed shape M′ from the housing 10 indicated by M, and the condensed shape N′ from the housing 10 indicated by N are overlapped. As shown in the graph of FIG.
- the lights which are emitted from the two housings 10 are condensed onto one point. Therefore, it shows a high peak of the light intensity both in the short axis (X axis) and the long axis (Y axis), and it shows that the light density of the light condensed position SP is high.
- the two housings 10 which respectively have two lines of light sources in which four light sources are aligned in the short axis (that is, X axis/up and down direction in the drawing).
- Such two housings 10 are placed being adjacent to each other (refer to P and Q), and the two housings 10 indicated by P and Q have the same shapes, and have the side view shape in which the mounted surface to the heat dissipation plate 60 is slanted.
- the housing as indicated by P as illustrated in the side view shape which is seen from the arrow C-C of FIG.
- the housing 10 has a shape in which the mounted surface to the heat dissipation plate 60 is slanted with a predetermined angle. While it is preferable that the slant angle should ranges from 0.25 to 2 degrees, as mentioned above, FIGS. 2A to 2C actually emphasizes the slant angle. Accordingly, in the case where the mounting surface of the heat dissipation plate 60 is arranged perpendicularly to the optical axis of the condensed lens 20 , a light which is emitted from the housing 10 indicated by P enters the condensed lens 20 with a certain incident angle corresponding to the predetermined slant angle. Thus, the light enters the condensed lens 20 with the predetermined angle to the optical axis 21 . The light is emitted downward from the housing 10 as indicated by P in comparison with the perpendicular direction to the drawing which corresponds to the direction of the optical axis 21 of the condenser lens 20 .
- the housing 10 indicated by Q which has the same shape (the shape in which the mounted surface is slanted with the predetermined angle) with the housing 10 indicated by P
- the housing 10 indicated by Q is fixed with rotating by 180 degrees to the housing 10 indicated by P around the approximately optical axis of the light which is emitted from the housing 10 . Accordingly, the light is emitted upward from the housing 10 indicated by Q in comparison with the perpendicular direction to the drawing which corresponds to the direction of the optical axis 21 of the condenser lens 20 .
- the light enters the condenser lens 20 with the incident angle corresponding to the predetermined angle with respect to the optical axis 21 of the condenser lens 20 (this, the light enters the condenser lens 20 with the predetermined angle with respect to the optical axis 21 ).
- a condensed shape (refer to P′ and Q′) of the light condensed position SP formed by the condensed light from the condenser lens 20 and a light intensity distribution (sectional light intensity) of the light condensed position SP in this case are shown by a shape and a graph in FIG. 3B .
- a light from the housing 10 as indicated P is condensed at the lower position of the drawing to form the condensed shape P′
- a light from the housing 10 as indicated Q is condensed at the upper position of the drawing to form the condensed shape Q′.
- the lights which is emitted from the two housings 10 are condensed onto two positions separately, not condensed onto one position, it shows two peaks of the light intensity in the short axis (X axis), as illustrated in FIG. 3B . Accordingly, the peak light intensity in this case is lower than the case as shown in FIG. 3A .
- the peak light intensity becomes the value to be calculated such that the peak light intensity P 0 is divided by the number of condensed positions, the value of the case of FIG. 3B becomes a half of the original peak light intensity.
- the light intensity is almost even in the long axis (Y axis). Therefore, the light density of the housings 10 as shown in FIG. 2B is lower than that of the housings 10 as shown in FIG. 2A , in which the housings 10 is mounted without being inclined. In the direction of the long axis (Y axis), it may have the Gaussian distribution according to the distance between the housing 10 indicated by P and the housing indicated by Q.
- the four housings 10 which respectively have two lines of light sources in which two light sources are aligned in the short axis (that is, X axis/up and down direction in the drawing).
- Such four housings 10 are placed being adjacent to one another (one housing is adjacent to two housings; refer to R, S, T and U), and the four housings 10 indicated by R, T, S and U have the same shapes, and have the side view shape in which the mounted surface to the heat dissipation plate 60 is slanted with a predetermined angle.
- the housing 10 indicated by R is determined as a basis
- the housing 10 indicated by S, T and U are fixed with rotating by 90, 180 and 270 degrees in the anticlockwise rotation relative to the housing 10 as indicated by R approximately around the optical axis of the light emitted from the housing 10 . Accordingly, if the mounting surface of the heat dissipation plate 60 is arranged perpendicularly to the optical axis of the condensed lens 20 , the light is emitted downward from the housing 10 indicated by R in comparison with the perpendicular direction to the drawing which corresponds to the direction of the optical axis 21 of the condenser lens 20 .
- the light is emitted rightward from the housing 10 indicated by S in comparison with the perpendicular direction to the drawing which corresponds to the direction of the optical axis 21 of the condenser lens 20 .
- the light is emitted upward from the housing 10 indicated by T in comparison with the perpendicular direction to the drawing which corresponds to the direction of the optical axis 21 of the condenser lens 20 .
- the light is emitted leftward from the housing 10 as indicated by U in comparison with the perpendicular direction to the drawing which corresponds to the direction of the optical axis 21 of the condenser lens 20 .
- the light enters the condenser lens 20 with the incident angle corresponding to the predetermined angle with respect to the optical axis 21 of the condenser lens 20 (thus, the light enters the condenser lens 20 with the predetermined angle to the optical axis 21 ).
- a condensed shape (refer to R′, S′, T′ and U′) of the light condensed position SP formed by the condensed light from the condenser lens 20 and a light intensity distribution (sectional light intensity) on the light condensed position SP are shown by a shape and a graph in FIG. 3C .
- a light from the housing 10 indicated by R is condensed at the lower position of the drawing and to form the condensed shape R′.
- a light from the housing 10 indicated by S is condensed at the right side position of the drawing to form the condensed shape S′.
- a light from the housing 10 indicated by T is condensed at the upper position of the drawing to form the condensed shape T′.
- the peak light intensity becomes the value to be calculated such that the peak light intensity P 0 in the case of single converging position is divided by the number of condensed positions, the value of the case of FIG. 3C becomes a quarter of the original peak light intensity.
- the light density of FIG. 3C corresponding to the housings 10 as shown in FIG. 2C is much lower than the light density of FIG. 3A corresponding to the housings 10 as shown in FIG. 2A , and lower than the light density of FIG. 3B corresponding to the housings 10 as shown in FIG. 2B .
- the light density of the housings 10 of FIG. 2C becomes much lower than the housings 10 of FIG. 2A which is mounted without being inclined.
- the light intensity is the lowest in the embodiment as shown in FIG. 2 C (refer to the graph of FIG. 3 C). However, even in the embodiment as shown in FIG. 2 B (refer to the graph of FIG. 3 B), the light intensity is also low enough in comparison with the case of FIG. 2 A (refer to the graph of FIG. 3 A), and it can sufficiently suppress the degradation of the emission efficiency of phosphor.
- the plurality of housings are fixed to the same heat dissipation plate (supporting member) 60 , since the mount angles of the housings 10 to the heat dissipation plate (supporting member) 60 differ from each other, their incline angles with respect to the optical axis of the condenser lens 20 are different respectively. Therefore, the lights emitted from the plurality of housings are condensed onto the phosphor wheel 30 by the condenser lens 20 , the lights are condensed at the different positions on the phosphor of the phosphor wheel 30 . Therefore, the light density can sufficiently be lowered, and the light emitted from the phosphor can be utilized efficiently.
- the light source apparatus 1 can be manufactured without lowering productivity.
- the light source apparatus 1 which can suppress degradation of the emission efficiency of phosphor as much as possible, and can be manufactured without lowering the productivity while achieving simple assembly.
- each light source is aligned in the short axis (X axis) of the far field pattern, and the mount angle of each housing 10 is varied in the direction of rotating around the long axis (Y axis) of the far field pattern, it can prevent a light which is emitted from each light source 10 from interfering with others, and it can adequately lower the light density at the light condensed position SP.
- the light density at the light condensed position SP can securely be suppressed, and the light source apparatus 1 can be manufactured without lowering the productivity.
- the incident angle of the light which is emitted from each housing 10 to the optical axis of the condenser lens 20 can be made different. Therefore, it can certainly lower the light density at the light condensed position SP with using very simple configuration.
- the incident angle of the light emitted from each housing 10 to the optical axis of the condenser lens 20 can be made different. Therefore, it can securely lower the light density at the light condensed position SP with using very simple configuration.
- the light density can be lowered without enlarging the area of the light condensed position SP so much.
- the housing 10 can be cooled efficiently, and it can facilitate downsizing of the light source apparatus 1 with reducing the number of components.
- the mounted surface of the housing 10 to the mounting surface of the heat dissipation member 60 is slanted in the above mentioned embodiment, it is not limited thereto, and it is also possible that the mounting surface of the heat dissipation member 60 which is a supporting member is slanted and thereby varying the incident angle of the light which is emitted from each housing 10 with respect to the optical axis of the condenser lens 20 .
- the mounted surface of the housing 10 is not slanted, and it can have a rectangular side shape.
- a shape of the housing 10 can be simplified so that the housing 10 can be replaced easily with a low cost at the time of maintenance or the like.
- heat dissipation member 60 is used as a supporting member to which the housing 10 is fixed in the above mentioned embodiment, it is not limited thereto, and any member can be used as a supporting member according to intended use.
- FIG. 4 illustrates the case that the collimating lens 13 is located at the focusing position that a collimated light is emitted from the collimating lens 13 .
- FIG. 4B illustrates the case that the collimating lens 13 is located closer to the laser diode 12 by about 0.2 mm in comparison with the focusing position that a light is emitted from the collimating lens 13 in parallel.
- the housing 10 is configured to be fixed to the heat dissipation member (supporting member) 60 with being inclined by the predetermined angle, as described with referring to FIGS. 1 and 2 .
- the shift length of the collimating lens 13 from the focusing point preferably ranges from 0.1 to 0.5 mm. While the collimating lens 13 is shifted to the laser diode 12 side in FIG. 4B , it is also possible that the collimating lens 13 is shifted to the condenser lens 20 side.
- FIGS. 4A and 4B a condensed shape of the light condensed position SP formed by the condensed light from the condenser lens 20 and a light intensity distribution (sectional light intensity) of the light condensed position SP are shown in FIGS. 4 C and 4 D.
- FIG. 4C illustrates the condensed shape and the light intensity distribution (sectional light intensity) in the case that the collimating lens 13 is located at the focusing position
- FIG. 4D illustrates the condensed shape and the light intensity distribution (sectional light intensity) in the case that the collimating lens 13 is shifted from the focusing position.
- the area of the light condensed position SP in the case of FIG. 4 D is larger than that in the case of FIG. 4C
- the peak optical intensity in the case of FIG. 4D is lower than that in the case of FIG. 4C .
- r 0 is a radius of the light condensed diameter of the light condensed position SP in the case that the collimating lens 13 is located at the focusing position
- r is a radius of the light condensed diameter of the light condensed position SP in the case that the collimating lens 13 is shifted from the focusing position.
- the radius of the light condensed diameter in FIG. 4C is about 0.1 mm, and the radius of the light condensed diameter in FIG. 4D is about 1 mm. Therefore, the peak light intensity in the case that the collimating lens 13 is shifted from the focusing position becomes 1/100 in comparison with the case that the collimating lens 13 is located at the focusing position.
- the housings 10 are configured to be fixed to the heat dissipation member 60 as a supporting member with being inclined with the predetermined angle, so that the light density at the light condensed position SP formed by the light from the plurality of the housings 10 can be reduced.
- the light density can be further reduced as mentioned below.
- each light source in the case that the location of the collimating lens 13 to the laser diode 12 is shifted from the focusing position, a light emitted from the collimating lens 13 becomes different from the parallel light, so that the area of the light condensed position on the phosphor can be enlarged as well as that the shift of the condensed positions formed by the lights from the plurality of the laser diodes 12 can be reduced.
- the light intensity can be lowered by enlarging the area of the light condensed position. That is, since a light intensity of the light condensed position can be lowered, a light which is emitted from the phosphor can be used efficiently.
- a position of the light condensed position formed by the light from each laser diode 12 placed in the same housing 10 is not shifted so much, increase of the area of total condensed positions can be adequately suppressed.
- the graph of FIG. 6 illustrates relationship between an optical output of the light from the phosphor and an optical output of the excitation light.
- a dotted line indicated by (A) shows an output from the phosphor according to the embodiment of combining the embodiment as illustrated in FIG. 2A that the housing 10 is not inclined, and the embodiment as illustrated in FIG. 4B that the collimating lens 13 is shifted from the focusing position.
- a dashed line indicated by (B) shows an output from the phosphor according to the embodiment of combining the embodiment that the housing 10 is inclined and rotated as illustrated in FIG. 2B , and the embodiment as illustrated in FIG. 4B that the collimating lens 13 is shifted from the focusing position.
- a solid line indicated by (C) shows an output from the phosphor according to the embodiment of combining the embodiment as illustrated in FIG. 2C that the housing 10 is inclined and rotated, and the embodiment as illustrated in FIG. 4B that the collimating lens 13 is shifted from the focusing position.
- a small dotted line indicated by (D) shows an output from the phosphor according to the embodiment of combining the embodiment as illustrated in FIG. 2A that the housing 10 is not inclined, and the embodiment as illustrated in FIG. 4A that the collimating lens 13 is located at the focusing position.
- the small solid line (D) in the case of the embodiment that the housing 10 is not inclined as illustrated in FIG. 2( a ) and the collimating lens 13 is located at the focusing position as illustrated in FIG. 4A , if the optical output of the excitation light is increased, the output of the light from the phosphor reaches the peak and then gradually reduces.
- the effect as shown in FIG. 3B or 3 C and the effect as shown in FIG. 4B allows for suppressing the saturation of the optical output of the light from the phosphor, and thus the phosphor can be used effectively even if an output from the housing 10 is high. It is because the light density can be lowered at the light condensed position SP, and thus the degradation of the emission efficiency of phosphor can be sufficiently suppressed.
- the phosphor can be used more efficiently in the embodiment as indicated by the solid line (C) corresponding to FIG. 2C and FIG. 3C in comparison with the graph of the dashed line (B). However, even in the case of the dashed line (B) corresponding to FIG. 2B and FIG. 3B , it clearly shows a high performance relating to the optical output of the light from the phosphor.
- combining the above mentioned first embodiment and the above mentioned second embodiment allows lights emitted from the plurality of housings 10 to be condensed onto different positions respectively and the area of the light condensed position of the light from each housing 10 to be large enough, so that the light density can sufficiently be lowered and the degradation of the emission efficiency of phosphor can be sufficiently suppressed.
- the positions of the light condensed positions of the light which is emitted from the plurality of housing 10 are varied, and thereby lowering the light density at the light condensed position SP.
- the shape of the light condensed position SP of the phosphor can be enlarged without loss of the etendue, and thus the light density at the light condensed position SP can be lowered. Accordingly, it can sufficiently suppress the degradation of the emission efficiency of phosphor, and the phosphor can be used efficiently.
- the plurality of housings 10 having the same shape can be incorporated with changing its arrangement, the productivity can be prevented from being lowered.
- the number of the housing 10 is not limited to that of the above mentioned embodiments, but can be any number as long as the number is 2 or more.
- the number of the laser diode 12 in the housing 10 can be any number as long as the number is 2 or more.
- one collimating lens 13 corresponds to one laser diode 12 , for example, a lens array can be applied.
- FIG. 7 illustrates a schematic diagram for describing a configuration of a projector 100 having the light source apparatus 1 according to the above mentioned embodiments, and it is schematic plain view seeing the light source apparatus 1 and the projector 100 from the above.
- the light source apparatus 1 there are two housings 10 being adjacent to each other, and one housing 10 is inclined upward and another housing 10 is inclined downward. Such arrangement allows the incline angles of the lights emitted from the two housings 10 with respect to the optical axis of the condenser lens 20 to be made different from each other.
- the number of the housings 10 is not limited to 2, but any number of the housings 10 as mentioned above can be provided.
- the light which is emitted from the light source apparatus 1 is reflected by DMD element (Digital Micromirror Device) 110 which is a light modulating element, the reflected light forms an image, and thereby forming the images, and then the image is enlarged and projected to the screen SC by a projecting lens 120 which acts as a projecting device.
- DMD element 110 Digital Micromirror Device
- micro mirrors which correspond to each pixel of the images projected on the screen are arranged in matrix.
- the light projected to the screen can be on/off controlled in micro seconds by changing the inclined angle of each of the micro mirrors.
- the projecting lens 120 can change the intensity of the light which enters the projecting lens 120 according to the ratio between the on time of each micro mirror and the off time of each micro mirror, and thus achieving the gradation display based on the image data projected to the screen.
- DMD element is used as a light modulating element in this embodiment, it is not limited thereto, and any other light modulating element can be applied according to intended use.
- a light source apparatus and a projector according to the present invention are not limited to the above mentioned embodiments, but various other embodiments are included in the present invention.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Optics & Photonics (AREA)
- Signal Processing (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Astronomy & Astrophysics (AREA)
- Projection Apparatus (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Fastening Of Light Sources Or Lamp Holders (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Semiconductor Lasers (AREA)
Abstract
Description
- The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2014-176354, filed on Aug. 29, 2014. The content of this application is incorporated herein by reference in their entirety.
- 1. Field of the Invention
- The disclosure relates to a light source apparatus and a projector having the light source apparatus.
- 2. Description of the Related Art
- Recently, a time divisional type projector has become popular. The time divisional type projector emits lights of a plurality of wavelengths and forms images by modulating the emitted lights of the plurality of wavelengths sequentially, and then projects the formed images. As a light source apparatus used for the time divisional type projector, for example, there is known a light source apparatus having a light source that outputs a white light, and a rotating wheel to which a plurality of color filters are attached. According to such light source apparatus, the light source emits the white light to the rotating wheel which rotates at constant speed, and thereby emitting lights of a plurality of wavelengths (such as blue, green and red lights) in a time divisional manner.
- Further, there is also proposed a light source apparatus including a light source that outputs a light of a single wavelength, such as a laser diode, and a rotating wheel having phosphor layers instead of color filters. According to such light source apparatus, the light source emits the light of a single wavelength to the rotating wheel which rotates at constant speed, and thereby emitting lights of a plurality of wavelengths in a time divisional manner. For example, it is possible to convert wavelength of a blue light from a laser diode into that of a green or red light by using phosphors. In such light source apparatuses, as described in JP 2011-133782 A, there is proposed a method to enlarge an approximately oval shape of a light which is emitted from a laser light source and condensed onto the phosphors by installing the laser light source rotated around its optical axis, and thereby making uniform brightness for projecting.
- As described in JP 2012-215633 A, there is proposed a method to change a position of the light condensed position of each laser light source on the phosphor by varying distances of the plurality of laser light sources and distances of collimator lenses located at the output side of the laser light sources, and thereby exciting the phosphors with a low light intensity.
- According to the light source apparatus described in JP 2011-133782 A, the rotating direction of each laser diode needs to be adjusted in the case of rotating the laser diode around the optical axis. Further, since a light emitted from each laser light source is condensed onto the same position, the light intensity at the light condensed point may be so high that the emission efficiency of phosphor is reduced. According to the light source apparatus described in JP 2012-215633, a position of a light condensed position of each laser light source can be changed. However, as a diameter of the light condensed position formed by a parallel light from the collimator lens is small, the light intensity of a parallel light from the collimator lens is high, so that the emission efficiency of phosphor may be reduced.
- One aspect of the light source apparatus according to the present invention is a light source apparatus comprising:
- a plurality of light sources each including a laser diode and a collimating lens, said collimating lens making a light emitted from said laser diode into an approximately collimated beam,
- a plurality of housings in which said plurality of light sources are placed so that each light emitted from each of said light source advances approximately in parallel in the same direction,
- a condenser lens which condenses lights emitted from said plurality of housings to a phosphor,
- a phosphor wheel having said phosphor, said phosphor wheel transmitting a light which is emitted from said condenser lens,
- wherein incident angles of the lights emitted from said housings to an optical axis of said condenser lens are made different by varying mount angles of said housings to a supporting member.
- One aspect of the projector according to the present invention is a projector comprising:
- the light source apparatus according to the above mentioned aspect,
- a light modulating device which modulates lights emitted from the light source apparatus in the plurality of wavelength ranges to form an image based on an image data,
- a projecting device which enlarges and projects the images.
-
FIG. 1 A illustrates a schematic diagram of a light source apparatus andFIG. 1 B illustrates an explanatory diagram of an optical axis for describing a light source apparatus according to one embodiment of the present invention. -
FIGS. 2A to 2C illustrate a schematic diagram for describing a light source apparatus according to a first embodiment of the present invention, in which mounted surfaces of the housings are slanted. -
FIGS. 3A to 3C illustrate a figure for describing a shape and a light intensity distribution (sectional light intensity) of the light condensed position in the first embodiment. -
FIGS. 4A to 4D illustrate a schematic diagram for describing a light source apparatus according to a second embodiment of the present invention in which positions of the collimating lenses are shifted, and a figure for describing a shape and a light intensity distribution (sectional light intensity) of the light condensed position. -
FIGS. 5A to 5B illustrates a schematic diagram for describing a phosphor wheel according to one embodiment of the present invention. -
FIG. 6 illustrates a graph for describing a light intensity of the phosphor in the case of combining the first and second embodiments and a light intensity of the phosphor in other cases. -
FIG. 7 illustrates a schematic diagram for describing a configuration of a projector according to one embodiment of the invention, which includes the above mentioned light source apparatus. - The light source apparatus according to
Aspect 1 of the present invention is a light source apparatus comprising: - a plurality of light sources each including a laser diode and a collimating lens, said collimating lens making a light emitted from said laser diode into an approximately collimated beam,
- a plurality of housings in which said plurality of light sources are placed so that each light emitted from each of said light source advances approximately in parallel in the same direction,
- a condenser lens which condenses lights emitted from said plurality of housings to a phosphor,
- a phosphor wheel having said phosphor, said phosphor wheel transmitting a light which is emitted from said condenser lens,
- wherein incident angles of the lights emitted from said housings to an optical axis of said condenser lens are made different by varying mount angles of said housings to a supporting member.
- According to this aspect, lights emitted from the plurality of housings are condensed onto different positions on the phosphor wheel (that is “on the phosphor”) by the condenser lens. Therefore, a light intensity at the light condensed position on the phosphor can be lowered, so that a light which is emitted from the phosphor can be used efficiently.
- Further, since the above mentioned effect can be achieved by simply varying the angles of mounting the housings to the supporting member, the light source apparatus can be manufactured without lowering the productivity.
- Accordingly, it is possible to provide the light source apparatus which can suppress degradation of the emission efficiency of phosphor as much as possible, and can be manufactured without lowering the productivity with achieving simple assembly.
- The light source apparatus according to Aspect 2 of the present invention is the light source apparatus according to the above mentioned
Aspect 1, - wherein, in said light source, a location of said collimating lens to said laser diode is shifted from a position of said collimating lens to emit a collimated light.
- According to this aspect, in each light source, since a light which is emitted from the collimating lens becomes different from the parallel light by shifting the location of the collimating lens with respect to the laser diode, a diameter of the light condensed position on the phosphor can be enlarged, while a shift of the location of the light condensed positions formed by the lights from the plurality of the laser diodes can be made smaller.
- Thus, while lights from the laser diodes placed in the same housing are condensed onto the approximately same place, a light intensity can be lowered by enlarging the area of the light condensed position.
- Accordingly, since a light intensity of the light condensed position can be lowered, a light which is emitted from the phosphor can be used efficiently. At the same time, since there is little deviation in the location of the light condensed positions of the laser diodes placed in the same housing, increase of the area of total condensed positions can be adequately reduced.
- Additionally, by combining the
Aspects 1 and 2, since lights from the plurality of housings are condensed onto different positions respectively, and the area of the light condensed positions formed by the lights from each housing is large enough, a light density can sufficiently be lowered, and thus the degradation of the emission efficiency of phosphor can be sufficiently suppressed. - The light source apparatus according to Aspect 3 of the present invention is the light source apparatus according to the above mentioned
Aspect 1 or 2, - wherein, in said housing, said light sources are aligned in a short axis of a far field pattern of said laser diode, and the mount angles of said housings are varied in the direction of rotating around a long axis of a far field pattern of said laser diode.
- According to this aspect, in the housing, since each of the light sources is aligned in the short axis of the far field pattern of the laser diode, and the mount angles of the housings are varied in the direction of rotating around the long axis of the far field pattern of the laser diode, a light emitted from each light source can be prevented from interfering with each other, and thus the light density at the light condensed position can be lowered adequately.
- The light source apparatus according to Aspect 4 of the present invention is the light source apparatus according to any one of the above mentioned
Aspects 1 to 3, - wherein said housings are mounted on the same supporting member, and mounted surfaces of said housings to said supporting member are slanted.
- According to this aspect, only by simply making slanted the mounted surfaces of the housings to the supporting member, a light density of the light condensed position can securely be lowered, and thus the light source apparatus can be manufactured without lowering the productivity.
- The light source apparatus according to Aspect 5 of the present invention is the light source apparatus according to the above mentioned Aspect 4,
- wherein two of said housings being adjacent to each other are fixed to said supporting member with rotating by 180 degrees to each other approximately around an optical axis of the light emitted from said housings.
- According to this aspect, fixing the housings having slanted mounted surfaces and having the same shape with each other to the supporting member so as to rotate by 180 degrees to each other, (in other words, rotating by 180 degrees in the same rotating direction) allows the incident angle of the light which is emitted from each housing with respect to an optical axis of the condenser lens to be made different. Therefore, it can certainly lower a light density at the light condensed position by using very simple configuration.
- The light source apparatus according to
Aspect 6 of the present invention is the light source apparatus according to the above mentioned Aspects 4, - wherein four of said housings being adjacent to one another are fixed to said supporting member with rotating by 90 degrees to one another around approximately an optical axis of the light emitted from said housings.
- According to this aspect, fixing the housings having slanted mounted surfaces and having the same shape with each other to the supporting member so as to rotate by 90 degrees to others, (in other words, rotating by 90, 180, 270 degrees in the same rotating direction) allows the incident angle of the light emitted from each housing to an optical axis of the condenser lens to be made different. Therefore, it can certainly lower the light density at the light condensed position by using very simple configuration.
- The light source apparatus according to Aspect 7 of the present invention is the light source apparatus according to any one of the above mentioned
Aspects 1 to 3, - wherein said housings are mounted on the same supporting member, and a mounting surface of said supporting member on which said housings are mounted is slanted.
- According to this aspect, by making slanted the mounting surface of the supporting member on which the housings are mounted, the incident angle of the light emitted from each housing to an optical axis of the condenser lens is made different. Therefore, once the supporting member is formed having the slanted mounting surface, a shape of the housing can be simplified so that the housing can be replaced easily with a low cost in the time of maintenance or the like.
- The light source apparatus according to Aspect 8 of the present invention is the light source apparatus according to any one of the above mentioned Aspects 4 to 7,
- wherein the slant angle of the mounted surface of said housing or the mounting surface of said supporting member is in a range from 0.25 to 2 degrees.
- According to this aspect, since the slant angle ranges from 0.25 to 2 degrees, the degradation of the emission efficiency of phosphor can be suppressed without enlarging the area of the light condensed position so much.
- The light source apparatus according to Aspect 9 of the present invention is the light source apparatus according to any one of the above mentioned
Aspects 1 to 8, - wherein the supporting member works as a heat dissipation member.
- According to this aspect, since the supporting member works as a heat dissipation member, the housing can be cooled efficiently, and downsizing of the light source apparatus with reducing the number of components can be facilitated.
- The light source apparatus according to
Aspect 10 of the present invention is the light source apparatus according to any one of the above mentionedAspects 1 to 9, - wherein one of said phosphors is a phosphor which emits a light including a red light.
- The light source apparatus according to
Aspect 11 of the present invention is the light source apparatus according to any one of the above mentionedAspects 1 to 10, - wherein the wavelength of lights emitted from said housings is in a range from 370 to 500 nm.
- The projector according to
Aspect 1 of the present invention is a projector comprising: - the light source apparatus according to any one of
Aspects 1 to 11 of the light source apparatus, - a light modulating device configured to modulates lights which are emitted from the light source apparatus in the plurality of wavelength ranges to form an image based on an image data,
- a projecting device which enlarges and projects the images.
- According to this aspect, it is possible to provide the projector which can suppress degradation of the emission efficiency of phosphor as much as possible, and can be manufactured without lowering the productivity with achieving simple assembly.
- Next, a light source apparatus and a projector having the light source apparatus according to embodiments of the present invention will be described in detail with referring to the attached drawings.
- (General Description of Light Source Apparatus)
- At first, a light source apparatus according to one embodiment of the present invention is described with referring to
FIG. 1 .FIG. 1A illustrates a schematic diagram of the light source apparatus andFIG. 1B illustrates an explanatory diagram of a short axis and a long axis of a far field pattern of said laser diode (a sectional view seeing from Arrow A-A) for describing the light source apparatus according to one embodiment of the present invention. As illustrated inFIG. 1A , thelight source apparatus 1 according to this embodiment includeshousings 10 which act as a light source position, acondenser lens 20, aphosphor wheel 30, a receivinglens 40, arotary driving apparatus 50 and aheat dissipation plate 60. - In this embodiment, blue lights are emitted from the
housings 10, and the emitted blue lights enter thecondenser lens 20. - The lights are converted by the converting lens 20 (details are described later), and then enters the
phosphor wheel 30 which is rotated by therotary driving apparatus 50. Thephosphor wheel 30 is formed by a material which transmits a light. Adielectric film 31 is formed on a light-incident surface of thephosphor wheel 30 concentrically, and aphosphor 32 is formed on light-emitting surface of thephosphor wheel 30 concentrically. In more detail, a green phosphor region, a red phosphor region and a blue-light transmissive region are formed on the light-emission surface of thephosphor wheel 30 concentrically. The green phosphor emits a green light when a blue light enters the green phosphor, and the red phosphor emits a red light when a blue light enters the red phosphor. Therefore, when a blue light from thecondenser lens 20 enters thephosphor wheel 30, a green light, a red light and a blue light is emitted from thephosphor wheel 30 in a time divisional manner, and enter the receivinglens 40. Then, the light is condensed by the receivinglens 40, and is outputted from thelight source apparatus 1. - A wavelength of the emitted lights of the
laser diodes 12 used in this embodiment is preferably in a range from 370 to 500 nm, and more preferably from 420 to 500 nm. - The plurality of
housings 10 are fixed to a mounting surface of theheat dissipation plate 60 which is a supporting member. InFIG. 1 , onehousing 10 is illustrated in a solid line and anotherhousing 10 is illustrated in a dotted line. Each of thehousings 10 is configured such that a plurality oflaser diodes 12 which emit blue lights, and a plurality ofcollimating lenses 13 which make lights emitted from thelaser diode 12 into approximately parallel lights are placed in amain body 11 of thehousing 10. In eachhousing 10, thelaser diodes 12 and thecollimating lenses 13 are arranged such that a light is emitted from each of thelaser diodes 12 in approximately parallel in the same direction. Eachhousing 10 is fixed to the heat dissipation plate (supporting member) 60 with varying a mount angle of eachhousing 10 with respect to the heat dissipation plate 60 (Refer to thehousing 10 of the solid line and thehousing 10 of the dotted line comparatively). Therefore, anoptical axis 14 of the light which is emitted from eachhousing 10 is not parallel to anoptical axis 21 of thecondenser lens 20, and thus the light from eachhousing 10 enters thecondenser lens 20 with a different incident angle respectively. Accordingly, as illustrated by the solid line and the dotted line inFIG. 1 , although the light is condensed onto the position on thephosphor wheel 30 by thecondenser lens 20, the light from eachhousing 10 is condensed onto different positions on thephosphor wheel 30 respectively. InFIG. 1 , although it is illustrated such that the light is condensed onto a surface of thedielectric film 31 formed on the light-incident surface of thephosphor wheel 30, it is possible to describe “the light is condensed onto different positions on thephosphor 32” because thedielectric film 31 is very thin and the light is not condensed nor diffused on thephosphor wheel 30. - The embodiment relating to the housing will be described in detail later.
- As mentioned above, the
dielectric film 31 is formed on the light-incident surface of thephosphor wheel 30, and thephosphor 32 is formed on the light-emission surface of thephosphor wheel 30 concentrically with thephosphor wheel 30. InFIG. 5 , a phosphor wheel according to one embodiment is illustrated schematically.FIG. 5 A illustrates the light-incident surface of thephosphor wheel 30 andFIG. 5 B illustrates the light-emission surface of thephosphor wheel 30. The green phosphor region, the red phosphor region and the blue-light transmissive region are formed on thephosphor wheel 30. In the green phosphor region, thedielectric film 31G which transmits a blue light and reflects a green light is formed on the light-incident surface side. Agreen phosphor 32G which has a green light wavelength range is formed on the light-emission surface side. Similarly, in the red phosphor region, thedielectric film 31R which transmits a blue light and reflects a red light is formed on the light-incident surface side, and ared phosphor 32R which has a red light wavelength range is formed on the light-emission surface side. In the blue-light transmissive region, thedielectric film 31B which transmits a blue light is formed on the light-incident surface side, and no phosphor is formed on the light emission surface side. However, thedielectric film 31B which transmits a blue light may be formed on the light-emission surface side as well as on the incident surface side. A light-scattering member such as a particle of SiO2, TiO2, Ba2So4 or the like is preferably formed thereon in order to improve luminance unevenness and color unevenness. - The
dielectric films phosphors laser diode 12 can be reflected back toward the receivinglens 30 by thedielectric films - The
phosphor 32G which is coated on the green phosphor region of thephosphor wheel 30 preferably emits a green light including the wavelength range of 500 to 560 nm. Specific examples of the materials of thephosphor 32G are β-Si6-Z: AlZOZN8-Z: Eu, Lu3Al5O12: Ce, Ca8MgSi4O16C12: Eu, Ba3Si6O12N2: Eu, (Sr, Ba, Ca)Si2O2N2: Eu. - The
phosphor 32R which is coated on the red phosphor region of thephosphor wheel 30 preferably emits a red light including the wavelength range of 600 to 800 nm. Specific examples of the materials of thephosphor 32R are (Sr, Ca) AlSiN3: Eu, CaAlSiN3: Eu, SrAlSiN3: Eu, K2SiN6: Mn. - The ratio among the green phosphor region, the red phosphor region and the blue-light transmissive region on the
phosphor wheel 30 can appropriately be determined. For example, the ratio can be calculated according to the chromaticity of a white light required for a projector and the efficiency of each phosphor or the like. In this embodiment, each of the green phosphor and the red phosphor region has an angle of 150 degrees, and the blue-light transmissive region has an angle of 60 degrees. - While the
phosphor wheel 30 has three regions which are for green, red and blue lights, it can have four regions or more. For example, a white light region with blue and yellow light may be further provided. The number of regions for green, red and blue lights can be increased respectively and 2 positions for each color. - The
phosphor wheel 30 is made of a transparent circular plate which transmits a light, and a center of thephosphor wheel 30 is fixed to the rotatingaxis 50 a of therotary driving apparatus 50. As a material of thephosphor wheel 30, any material having a high light-transmittance, such as glass, resin, sapphire or the like can be used. InFIG. 5A , a position indicated by “SP” shows the position to which a light emitted from the hosing 10 is condensed by the condenser lens 20 (the light condensed position). InFIG. 5B , the position indicated by “FL” shows the position in which the phosphor layer emits when a light is projected from the housing 10 (the phosphor position). - Further, it is also possible to add one more plate at the light-emission surface side and provide a band pass filter thereon. Accordingly, a purer green or red color can be obtained.
- Returning to the description of
FIG. 1 , therotary driving apparatus 50 is a brushless DC motor, and placed such that the rotatingaxis 50 a thereof and the optical axis 21 a of thecondenser lens 20 are located in parallel. Further, therotary driving apparatus 50 is fixed such that the surface of thephosphor wheel 30 is located perpendicularly to the rotatingaxis 50 a. A rotating speed of therotary driving apparatus 50 is a rotating speed according to a frame rate of moving images (the number of frames per second, a unit [fps]) to be played. For example, in the case where moving images are played at 60 [fps], a rotating speed of the rotary driving apparatus 50 (that is, the phosphor wheel 30) should be determined as integer multiples of 60 rounds per second. - A light which is emitted from the
phosphor wheel 30 is condensed by the receivinglens 40 and is outputted from thelight source apparatus 1. In the case where the light source apparatus is used for a light source for the projector, a light outputted by thelight source apparatus 1 is condensed onto a light modulating device, and the image formed by the light modulating device is enlarged and projected by a projecting device. An etendue which is calculated according to the relationship between the image size formed by the light modulating device and the projecting angle of the light projected by the projecting device is affected by “NA” of the receivinglens 40 and the size of emitting area of the phosphor. - Thus, the following formula is given:
-
(Size of image formed by Light modulating device)×(Projecting angle)=(Phosphor position FL)×(NA of Receiving lens) - Accordingly, since the phosphor emits a light in approximately Lambertian distribution, it is desirable that the light-receiving
lens 40 should have higher NA, and the phosphor position FL should be small. If the etendue of the phosphor side is higher than the etendue of the projecting device side, the difference causes reduction of the efficiency. - As mentioned above, since the light-receiving
lens 40 has high NA, it is desirable that the phosphor position FL should be as small as possible. In this case, however, a light density of a light fromhousing 10 may become high. In this embodiment, since it is preferable that the size of the phosphor position FL is preferably around 2 mm, it is preferable that the size of the light condensed position SP should be 2 mm or less. This size is not a size of the light condensed position of a light from eachhousing 10, but total area of the light condensed positions on the condition that the plurality ofhousings 10 are fixed. - (Description of Housing)
- Next, with referring to
FIGS. 1 to 3 , the housing according to one embodiment of the invention is described. The description of the housing includes a description of a first embodiment and a description of a second embodiment. In the first embodiment, incident angles of the lights which is emitted from thehousings 10 to the optical axis of thecondenser lens 20 are made different by varying a mount angle of eachhousing 10 with respect to the heat dissipation plate (supporting member) 60. In the second embodiment, a location of the collimatinglens 13 to thelaser diode 12 is shifted from the position of the collimating lens 13 (focusing position) to emit a collimated light. - (Description of First Embodiment)
- At first, the first embodiment of the present invention relating to the housing is described with referring to
FIGS. 1 to 3 . As illustrated inFIG. 1A , thelaser diodes 12 are aligned in a short axis (X axis) of a far field pattern of a diffused light emitted from thelaser diode 12, and the mount angle of thehousing 10 is varied by rotating around a long axis (Y axis) of a far field pattern of thelaser diode 12. InFIG. 1A , the vertical direction in the drawing corresponds to Y axis direction. In an explanatory diagram of axis (refer toFIG. 1B ) which is seen from the arrow A-A inFIG. 1A , the short axis (X axis) and the long axis (Y axis) in the far field pattern are illustrated. - In
FIG. 1A , four light sources (pairs of thelaser diode 12 and the collimating lens 13) are aligned in the short axis (X axis) in one line. However the number of the line not limited thereto, and it is possible to have a configuration having two lines where four light sources are aligned in the short axis (X axis) respectively, and further a configuration having 3 lines or more is also possible. - As mentioned above, the mount angle of the
housing 10 is changed as rotating around the long axis (Y axis) from the direction that a light emits from thehousing 10 in parallel to the optical axis of thecondenser lens 20. Therefore, the light which is emitted from thehousing 10 enters thecondenser lens 20 with an incident angle corresponding to the mount angle (slanted angle). Thus, the light enters thecondenser lens 20 with the angle corresponds to the mount angle (slanted angle) with respect to theoptical axis 21. As the mount angle (slanted angle), that is, the incident angle (the angle with respect to the optical axis of the condenser lens 20), 0.25 to 2 degrees are preferable as absolute values. - In the case where lights which are emitted from the
housings 10 enter thecondenser lens 20 in parallel to the optical axis of thecondenser lens 20, the lights are condensed onto the point on theoptical axis 21. On the contrary, in the case where the lights enter thecondenser lens 20 with a predetermined incident angle, the lights are condensed onto the different positions as illustrated inFIG. 1A . Therefore, in the case where the mount angle of eachhousing 10 is made different, a light emitted from eachhousing 10 is condensed onto every different point. In this case, however, setting the mount angle (slanted angle) to be in the range from 0.25 to 2 degrees as absolute values allows the area of the light condensed position SP (refer toFIG. 5A ) not to become so large on thephosphor wheel 30. - Next, with referring to
FIG. 2 , one embodiment in which thehousings 10 are mounted with being inclined on theheat dissipation plate 60 which is a supporting member is described. -
FIG. 2A illustrates twohousings 10 which respectively have two lines of light sources in which four light sources are aligned in the short axis (X axis which extends up and down direction in the drawing). Such twohousings 10 are placed being adjacent to each other (refer to M and N), and the twohousings 10 indicated by M and N are mounted on theheat dissipation plate 60 without being inclined. Thus, as illustrated in the side view shape which is seen from the arrow B-B ofFIG. 2A , thehousing 10 has a rectangular side shape, and the mounted surface and the light-emitting surface of thehousing 10 is arranged in parallel to the mounting surface of theheat dissipation plate 60. Therefore, arranging the mounting surface of theheat dissipation plate 60 perpendicularly to the optical axis of thecondensed lens 20 allows a light exists from thehousing 10 in parallel to the optical axis of thecondensed lens 20. A condensed shape (refer to M′ and N″) of the light condensed position SP of the light condensed by thecondenser lens 20 and a light intensity distribution (sectional light intensity) of the light condensed position SP are shown by a shape and a graph inFIG. 3A . The condensed shape M′ from thehousing 10 indicated by M, and the condensed shape N′ from thehousing 10 indicated by N are overlapped. As shown in the graph ofFIG. 3A , the lights which are emitted from the twohousings 10 are condensed onto one point. Therefore, it shows a high peak of the light intensity both in the short axis (X axis) and the long axis (Y axis), and it shows that the light density of the light condensed position SP is high. - Returning to
FIG. 2A-2C , inFIG. 2B , the twohousings 10 which respectively have two lines of light sources in which four light sources are aligned in the short axis (that is, X axis/up and down direction in the drawing). Such twohousings 10 are placed being adjacent to each other (refer to P and Q), and the twohousings 10 indicated by P and Q have the same shapes, and have the side view shape in which the mounted surface to theheat dissipation plate 60 is slanted. In the case of the housing as indicated by P, as illustrated in the side view shape which is seen from the arrow C-C ofFIG. 2B , thehousing 10 has a shape in which the mounted surface to theheat dissipation plate 60 is slanted with a predetermined angle. While it is preferable that the slant angle should ranges from 0.25 to 2 degrees, as mentioned above,FIGS. 2A to 2C actually emphasizes the slant angle. Accordingly, in the case where the mounting surface of theheat dissipation plate 60 is arranged perpendicularly to the optical axis of thecondensed lens 20, a light which is emitted from thehousing 10 indicated by P enters the condensedlens 20 with a certain incident angle corresponding to the predetermined slant angle. Thus, the light enters the condensedlens 20 with the predetermined angle to theoptical axis 21. The light is emitted downward from thehousing 10 as indicated by P in comparison with the perpendicular direction to the drawing which corresponds to the direction of theoptical axis 21 of thecondenser lens 20. - On the contrary, in the case of the
housing 10 indicated by Q, which has the same shape (the shape in which the mounted surface is slanted with the predetermined angle) with thehousing 10 indicated by P, thehousing 10 indicated by Q is fixed with rotating by 180 degrees to thehousing 10 indicated by P around the approximately optical axis of the light which is emitted from thehousing 10. Accordingly, the light is emitted upward from thehousing 10 indicated by Q in comparison with the perpendicular direction to the drawing which corresponds to the direction of theoptical axis 21 of thecondenser lens 20. The light enters thecondenser lens 20 with the incident angle corresponding to the predetermined angle with respect to theoptical axis 21 of the condenser lens 20 (this, the light enters thecondenser lens 20 with the predetermined angle with respect to the optical axis 21). - A condensed shape (refer to P′ and Q′) of the light condensed position SP formed by the condensed light from the
condenser lens 20 and a light intensity distribution (sectional light intensity) of the light condensed position SP in this case are shown by a shape and a graph inFIG. 3B . A light from thehousing 10 as indicated P is condensed at the lower position of the drawing to form the condensed shape P′, and a light from thehousing 10 as indicated Q is condensed at the upper position of the drawing to form the condensed shape Q′. Since the lights which is emitted from the twohousings 10 are condensed onto two positions separately, not condensed onto one position, it shows two peaks of the light intensity in the short axis (X axis), as illustrated inFIG. 3B . Accordingly, the peak light intensity in this case is lower than the case as shown inFIG. 3A . - With the peak light intensity P0 In the case of single converging position in
FIG. 3A , the peak light intensity P inFIG. 3B to be: P=P0/2, in the case of two converging positions. Thus, since the peak light intensity becomes the value to be calculated such that the peak light intensity P0 is divided by the number of condensed positions, the value of the case ofFIG. 3B becomes a half of the original peak light intensity. - The light intensity is almost even in the long axis (Y axis). Therefore, the light density of the
housings 10 as shown inFIG. 2B is lower than that of thehousings 10 as shown inFIG. 2A , in which thehousings 10 is mounted without being inclined. In the direction of the long axis (Y axis), it may have the Gaussian distribution according to the distance between thehousing 10 indicated by P and the housing indicated by Q. - Returning to
FIG. 2 , inFIG. 2C , the fourhousings 10 which respectively have two lines of light sources in which two light sources are aligned in the short axis (that is, X axis/up and down direction in the drawing). Such fourhousings 10 are placed being adjacent to one another (one housing is adjacent to two housings; refer to R, S, T and U), and the fourhousings 10 indicated by R, T, S and U have the same shapes, and have the side view shape in which the mounted surface to theheat dissipation plate 60 is slanted with a predetermined angle. In the case that thehousing 10 indicated by R is determined as a basis, thehousing 10 indicated by S, T and U are fixed with rotating by 90, 180 and 270 degrees in the anticlockwise rotation relative to thehousing 10 as indicated by R approximately around the optical axis of the light emitted from thehousing 10. Accordingly, if the mounting surface of theheat dissipation plate 60 is arranged perpendicularly to the optical axis of thecondensed lens 20, the light is emitted downward from thehousing 10 indicated by R in comparison with the perpendicular direction to the drawing which corresponds to the direction of theoptical axis 21 of thecondenser lens 20. The light is emitted rightward from thehousing 10 indicated by S in comparison with the perpendicular direction to the drawing which corresponds to the direction of theoptical axis 21 of thecondenser lens 20. The light is emitted upward from thehousing 10 indicated by T in comparison with the perpendicular direction to the drawing which corresponds to the direction of theoptical axis 21 of thecondenser lens 20. The light is emitted leftward from thehousing 10 as indicated by U in comparison with the perpendicular direction to the drawing which corresponds to the direction of theoptical axis 21 of thecondenser lens 20. In every case, the light enters thecondenser lens 20 with the incident angle corresponding to the predetermined angle with respect to theoptical axis 21 of the condenser lens 20 (thus, the light enters thecondenser lens 20 with the predetermined angle to the optical axis 21). - In this case, a condensed shape (refer to R′, S′, T′ and U′) of the light condensed position SP formed by the condensed light from the
condenser lens 20 and a light intensity distribution (sectional light intensity) on the light condensed position SP are shown by a shape and a graph inFIG. 3C . A light from thehousing 10 indicated by R is condensed at the lower position of the drawing and to form the condensed shape R′. A light from thehousing 10 indicated by S is condensed at the right side position of the drawing to form the condensed shape S′. A light from thehousing 10 indicated by T is condensed at the upper position of the drawing to form the condensed shape T′. A light from thehousing 10 indicated by U is condensed at the left side position of the drawing to form the condensed shape U′. Since the lights which is emitted from the fourhousings 10 are condensed onto four positions (R′, S′, T′ and U′) separately, not condensed onto one position, it shows respectively two peaks of the light intensity both in the short axis (X axis) and in the long axis (Y axis), as illustrated inFIG. 3C . With the peak light intensity P0 in the case of single converging position inFIG. 3A , the peak light intensity P inFIG. 3C to be: P=P0/4, in the case of four converging positions. That is, since the peak light intensity becomes the value to be calculated such that the peak light intensity P0 in the case of single converging position is divided by the number of condensed positions, the value of the case ofFIG. 3C becomes a quarter of the original peak light intensity. - Therefore, the light density of
FIG. 3C corresponding to thehousings 10 as shown inFIG. 2C is much lower than the light density ofFIG. 3A corresponding to thehousings 10 as shown inFIG. 2A , and lower than the light density ofFIG. 3B corresponding to thehousings 10 as shown inFIG. 2B . Thus, the light density of thehousings 10 ofFIG. 2C becomes much lower than thehousings 10 ofFIG. 2A which is mounted without being inclined. - The light intensity is the lowest in the embodiment as shown in
FIG. 2 C (refer to the graph ofFIG. 3 C). However, even in the embodiment as shown inFIG. 2 B (refer to the graph ofFIG. 3 B), the light intensity is also low enough in comparison with the case ofFIG. 2 A (refer to the graph ofFIG. 3 A), and it can sufficiently suppress the degradation of the emission efficiency of phosphor. - As mentioned above, in this embodiment, in the case that the plurality of housings are fixed to the same heat dissipation plate (supporting member) 60, since the mount angles of the
housings 10 to the heat dissipation plate (supporting member) 60 differ from each other, their incline angles with respect to the optical axis of thecondenser lens 20 are different respectively. Therefore, the lights emitted from the plurality of housings are condensed onto thephosphor wheel 30 by thecondenser lens 20, the lights are condensed at the different positions on the phosphor of thephosphor wheel 30. Therefore, the light density can sufficiently be lowered, and the light emitted from the phosphor can be utilized efficiently. - Further, since the above mentioned effect is realized only by varying the mount angles to the heat dissipation plate (supporting member) 60, the
light source apparatus 1 can be manufactured without lowering productivity. - Accordingly, it is possible to provide the
light source apparatus 1 which can suppress degradation of the emission efficiency of phosphor as much as possible, and can be manufactured without lowering the productivity while achieving simple assembly. - In the
housing 10, since each light source is aligned in the short axis (X axis) of the far field pattern, and the mount angle of eachhousing 10 is varied in the direction of rotating around the long axis (Y axis) of the far field pattern, it can prevent a light which is emitted from eachlight source 10 from interfering with others, and it can adequately lower the light density at the light condensed position SP. - Further, by simply making slanted the mounted surfaces of the
housings 10 to the heat dissipation plate (supporting member) 60, the light density at the light condensed position SP can securely be suppressed, and thelight source apparatus 1 can be manufactured without lowering the productivity. - Specifically, fixing the housings having slanted mounted surfaces and having the same shape with each other to heat dissipation plate (supporting member) 60 so as to rotate by 180 degrees to each other, (in other words, so as to rotate by 180 degrees in the same rotating direction, the incident angle of the light which is emitted from each
housing 10 to the optical axis of thecondenser lens 20 can be made different. Therefore, it can certainly lower the light density at the light condensed position SP with using very simple configuration. - Specifically, fixing the housings having slanted mounted surfaces and having the same shape with each other to heat dissipation plate (supporting member) 60 so as to rotate by 90 degrees to others, (in other words, so as to rotate by 90, 180, 270 degrees in the same rotating direction), the incident angle of the light emitted from each
housing 10 to the optical axis of thecondenser lens 20 can be made different. Therefore, it can securely lower the light density at the light condensed position SP with using very simple configuration. - Setting the slant angle of the mounted surface of the
housings 10 to the mounting surface of the heat dissipation plate (supporting member) 60 to be in the range from 0.25 to 2 degrees, the light density can be lowered without enlarging the area of the light condensed position SP so much. - Further, since the
heat dissipation member 60 is used as a supporting member, thehousing 10 can be cooled efficiently, and it can facilitate downsizing of thelight source apparatus 1 with reducing the number of components. - <Description of Alternative of First Embodiment>
- While the mounted surface of the
housing 10 to the mounting surface of theheat dissipation member 60 is slanted in the above mentioned embodiment, it is not limited thereto, and it is also possible that the mounting surface of theheat dissipation member 60 which is a supporting member is slanted and thereby varying the incident angle of the light which is emitted from eachhousing 10 with respect to the optical axis of thecondenser lens 20. In this case, the mounted surface of thehousing 10 is not slanted, and it can have a rectangular side shape. - Therefore, once the
heat dissipation member 60 as a supporting member is formed as mentioned above, a shape of thehousing 10 can be simplified so that thehousing 10 can be replaced easily with a low cost at the time of maintenance or the like. - While the
heat dissipation member 60 is used as a supporting member to which thehousing 10 is fixed in the above mentioned embodiment, it is not limited thereto, and any member can be used as a supporting member according to intended use. - (Description of Second Embodiment)
- Next, a second embodiment relating to the housing is described with referring to
FIG. 4 . In this embodiment, in the light source, a location of the collimatinglens 13 to thelaser diode 12 is shifted from the position of the collimating lens for emitting a light in parallel.FIG. 4A illustrates the case that the collimatinglens 13 is located at the focusing position that a collimated light is emitted from the collimatinglens 13.FIG. 4B illustrates the case that the collimatinglens 13 is located closer to thelaser diode 12 by about 0.2 mm in comparison with the focusing position that a light is emitted from the collimatinglens 13 in parallel. That is, the distance between the collimatinglens 13 and thelaser diode 12 is shorter by about 2 mm than the case that the collimatinglens 13 is located at the focusing position. In both cases as illustrated inFIGS. 4A and 4B , thehousing 10 is configured to be fixed to the heat dissipation member (supporting member) 60 with being inclined by the predetermined angle, as described with referring toFIGS. 1 and 2 . - The shift length of the collimating
lens 13 from the focusing point preferably ranges from 0.1 to 0.5 mm. While the collimatinglens 13 is shifted to thelaser diode 12 side inFIG. 4B , it is also possible that the collimatinglens 13 is shifted to thecondenser lens 20 side. - In the arrangement as illustrated in
FIGS. 4A and 4B , a condensed shape of the light condensed position SP formed by the condensed light from thecondenser lens 20 and a light intensity distribution (sectional light intensity) of the light condensed position SP are shown inFIGS. 4 C and 4 D. -
FIG. 4C illustrates the condensed shape and the light intensity distribution (sectional light intensity) in the case that the collimatinglens 13 is located at the focusing position, andFIG. 4D illustrates the condensed shape and the light intensity distribution (sectional light intensity) in the case that the collimatinglens 13 is shifted from the focusing position. - Comparing the case that the collimating
lens 13 is located at the focusing position as illustrated inFIG. 4C and the case that the collimatinglens 13 is shifted from the focusing position as illustrated inFIG. 4D with each other, the area of the light condensed position SP in the case of FIG. 4D is larger than that in the case ofFIG. 4C , and the peak optical intensity in the case ofFIG. 4D is lower than that in the case ofFIG. 4C . - With the peak light intensity P0 of the light condensed position SP in the case that the collimating
lens 13 is located at the focusing position, the peak light intensity P′ at the light condensed position SP in the case that the collimatinglens 13 is shifted from the focusing position to be P′=P0/(πr0 2/πr2). Where “r0” is a radius of the light condensed diameter of the light condensed position SP in the case that the collimatinglens 13 is located at the focusing position, “r” is a radius of the light condensed diameter of the light condensed position SP in the case that the collimatinglens 13 is shifted from the focusing position. - The radius of the light condensed diameter in
FIG. 4C is about 0.1 mm, and the radius of the light condensed diameter inFIG. 4D is about 1 mm. Therefore, the peak light intensity in the case that the collimatinglens 13 is shifted from the focusing position becomes 1/100 in comparison with the case that the collimatinglens 13 is located at the focusing position. - Even in the cases as illustrated in
FIGS. 4A and 4C , thehousings 10 are configured to be fixed to theheat dissipation member 60 as a supporting member with being inclined with the predetermined angle, so that the light density at the light condensed position SP formed by the light from the plurality of thehousings 10 can be reduced. In the cases as illustrated inFIGS. 4B and 4D , the light density can be further reduced as mentioned below. - In each light source, in the case that the location of the collimating
lens 13 to thelaser diode 12 is shifted from the focusing position, a light emitted from the collimatinglens 13 becomes different from the parallel light, so that the area of the light condensed position on the phosphor can be enlarged as well as that the shift of the condensed positions formed by the lights from the plurality of thelaser diodes 12 can be reduced. - Thus, while lights which is emitted from the
laser diodes 12 placed in thesame housing 10 are condensed onto the approximately same place, the light intensity can be lowered by enlarging the area of the light condensed position. That is, since a light intensity of the light condensed position can be lowered, a light which is emitted from the phosphor can be used efficiently. At the same time, since a position of the light condensed position formed by the light from eachlaser diode 12 placed in thesame housing 10 is not shifted so much, increase of the area of total condensed positions can be adequately suppressed. - (Description of Combination of First Embodiment and Second Embodiment)
- Next, an optical output from the phosphor by combining the first embodiment that the mount angle of the
housing 10 is varied, and the second embodiment that the collimatinglens 13 is shifted from the focusing position is described with referring to a graph ofFIG. 6 . - The graph of
FIG. 6 illustrates relationship between an optical output of the light from the phosphor and an optical output of the excitation light. A dotted line indicated by (A) shows an output from the phosphor according to the embodiment of combining the embodiment as illustrated inFIG. 2A that thehousing 10 is not inclined, and the embodiment as illustrated inFIG. 4B that the collimatinglens 13 is shifted from the focusing position. - A dashed line indicated by (B) shows an output from the phosphor according to the embodiment of combining the embodiment that the
housing 10 is inclined and rotated as illustrated inFIG. 2B , and the embodiment as illustrated inFIG. 4B that the collimatinglens 13 is shifted from the focusing position. - A solid line indicated by (C) shows an output from the phosphor according to the embodiment of combining the embodiment as illustrated in
FIG. 2C that thehousing 10 is inclined and rotated, and the embodiment as illustrated inFIG. 4B that the collimatinglens 13 is shifted from the focusing position. - A small dotted line indicated by (D) shows an output from the phosphor according to the embodiment of combining the embodiment as illustrated in
FIG. 2A that thehousing 10 is not inclined, and the embodiment as illustrated inFIG. 4A that the collimatinglens 13 is located at the focusing position. - As indicated by the small solid line (D), in the case of the embodiment that the
housing 10 is not inclined as illustrated inFIG. 2( a) and thecollimating lens 13 is located at the focusing position as illustrated inFIG. 4A , if the optical output of the excitation light is increased, the output of the light from the phosphor reaches the peak and then gradually reduces. - As indicated by the dotted line (A), in the case of the embodiment that the
housing 10 is not inclined as illustrated inFIG. 2A , and thecollimating lens 13 is shifted from the focusing position as illustrated inFIG. 4B , if the output of the excitation light is increased, the output of the light from the phosphor is also increased, but gradually saturated. - On the contrary, as indicated by the dashed line (B) or the solid line (C), in the embodiment that the
housing 10 is inclined and rotated as illustrated inFIG. 2B or 2C and thecollimating lens 13 is shifted from the focusing position as illustrated inFIG. 4B , the effect as shown inFIG. 3B or 3C and the effect as shown inFIG. 4B allows for suppressing the saturation of the optical output of the light from the phosphor, and thus the phosphor can be used effectively even if an output from thehousing 10 is high. It is because the light density can be lowered at the light condensed position SP, and thus the degradation of the emission efficiency of phosphor can be sufficiently suppressed. The phosphor can be used more efficiently in the embodiment as indicated by the solid line (C) corresponding toFIG. 2C andFIG. 3C in comparison with the graph of the dashed line (B). However, even in the case of the dashed line (B) corresponding toFIG. 2B andFIG. 3B , it clearly shows a high performance relating to the optical output of the light from the phosphor. - Accordingly, combining the above mentioned first embodiment and the above mentioned second embodiment allows lights emitted from the plurality of
housings 10 to be condensed onto different positions respectively and the area of the light condensed position of the light from eachhousing 10 to be large enough, so that the light density can sufficiently be lowered and the degradation of the emission efficiency of phosphor can be sufficiently suppressed. - As mentioned above, in the
light source apparatus 1 according to the embodiment of the present invention, by placing thehousing 10 with inclining and rotating the mounted surface of thehousing 10, the positions of the light condensed positions of the light which is emitted from the plurality ofhousing 10 are varied, and thereby lowering the light density at the light condensed position SP. Further, by shifting the location of the collimatinglens 13, the shape of the light condensed position SP of the phosphor can be enlarged without loss of the etendue, and thus the light density at the light condensed position SP can be lowered. Accordingly, it can sufficiently suppress the degradation of the emission efficiency of phosphor, and the phosphor can be used efficiently. Further, since the plurality ofhousings 10 having the same shape can be incorporated with changing its arrangement, the productivity can be prevented from being lowered. - The number of the
housing 10 is not limited to that of the above mentioned embodiments, but can be any number as long as the number is 2 or more. The number of thelaser diode 12 in thehousing 10 can be any number as long as the number is 2 or more. Further, in the above mentioned embodiments, while onecollimating lens 13 corresponds to onelaser diode 12, for example, a lens array can be applied. - (Description of Projector)
- Next, a case that the above mentioned
light source apparatus 1 is used as a light source apparatus for the DLP projector of one-chip type is described with referring toFIG. 7 .FIG. 7 illustrates a schematic diagram for describing a configuration of a projector 100 having thelight source apparatus 1 according to the above mentioned embodiments, and it is schematic plain view seeing thelight source apparatus 1 and the projector 100 from the above. In thelight source apparatus 1, there are twohousings 10 being adjacent to each other, and onehousing 10 is inclined upward and anotherhousing 10 is inclined downward. Such arrangement allows the incline angles of the lights emitted from the twohousings 10 with respect to the optical axis of thecondenser lens 20 to be made different from each other. The number of thehousings 10 is not limited to 2, but any number of thehousings 10 as mentioned above can be provided. - In
FIG. 7 , the light which is emitted from thelight source apparatus 1 is reflected by DMD element (Digital Micromirror Device) 110 which is a light modulating element, the reflected light forms an image, and thereby forming the images, and then the image is enlarged and projected to the screen SC by a projectinglens 120 which acts as a projecting device. In theDMD element 110, micro mirrors which correspond to each pixel of the images projected on the screen are arranged in matrix. The light projected to the screen can be on/off controlled in micro seconds by changing the inclined angle of each of the micro mirrors. - Further, it can change the intensity of the light which enters the projecting
lens 120 according to the ratio between the on time of each micro mirror and the off time of each micro mirror, and thus achieving the gradation display based on the image data projected to the screen. - While the DMD element is used as a light modulating element in this embodiment, it is not limited thereto, and any other light modulating element can be applied according to intended use. A light source apparatus and a projector according to the present invention are not limited to the above mentioned embodiments, but various other embodiments are included in the present invention.
- While the present invention has been described according to the embodiments with a certain degrees of details, contents of disclosure of the embodiments shall be varied in details of the configuration, and the combination of elements and the change of order in the embodiment can be realized without deviating from the scope of the claims and concepts of the present invention.
-
- 1 Light Source Apparatus
- 10 Housing
- 11 Main body of Housing
- 12 Laser diode
- 13 Collimating lens
- 14 Optical Axis of Laser diode
- 20 Condenser lens
- 21 Optical Axis of Condenser lens
- 30 Phosphor Wheel
- 31 Dielectric Film
- 32 Phosphor
- 40 Receiving Lens
- 50 Rotary Driving Apparatus
- 50 a Rotating axis
- 60 Heat dissipation plate (Supporting Member)
- 100 Projector
- 110 DMD Element
- 120 Projecting Lens
- SC Screen
- SP Light Condensed Position
- FL Phosphor Position
Claims (12)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014176354A JP6815715B2 (en) | 2014-08-29 | 2014-08-29 | Light source device and projector equipped with the light source device |
JP2014-176354 | 2014-08-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20160065919A1 true US20160065919A1 (en) | 2016-03-03 |
US9456188B2 US9456188B2 (en) | 2016-09-27 |
Family
ID=54010971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/838,466 Active US9456188B2 (en) | 2014-08-29 | 2015-08-28 | Light source apparatus and projector having light source apparatus |
Country Status (4)
Country | Link |
---|---|
US (1) | US9456188B2 (en) |
EP (1) | EP2990869B1 (en) |
JP (1) | JP6815715B2 (en) |
CN (2) | CN105388689A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160091782A1 (en) * | 2014-09-30 | 2016-03-31 | Seiko Epson Corporation | Light source apparatus and projector |
US20160223891A1 (en) * | 2015-02-02 | 2016-08-04 | Nichia Corporation | Light source device and projector having the light source device |
US20180210211A1 (en) * | 2017-01-26 | 2018-07-26 | Seiko Epson Corporation | Illuminator and projector |
US20190331992A1 (en) * | 2018-04-27 | 2019-10-31 | Panasonic Intellectual Property Management Co., Ltd. | Phosphor wheel, light source device, and projection display apparatus |
US10845578B2 (en) | 2019-02-05 | 2020-11-24 | Panasonic Intellectual Property Management Co., Ltd. | Light source device and projection display apparatus |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6815715B2 (en) * | 2014-08-29 | 2021-01-20 | 日亜化学工業株式会社 | Light source device and projector equipped with the light source device |
JP6187612B2 (en) * | 2015-02-02 | 2017-08-30 | 日亜化学工業株式会社 | Light source device and projector provided with the light source device |
CN111722459B (en) * | 2019-03-19 | 2022-08-26 | 青岛海信激光显示股份有限公司 | Laser device assembly, laser light source and laser projection equipment |
CN109613789B (en) * | 2019-01-24 | 2021-04-20 | 苏州佳世达电通有限公司 | Optical-mechanical module and projection device comprising same |
JP2021048354A (en) * | 2019-09-20 | 2021-03-25 | 日亜化学工業株式会社 | Light-emitting device |
CN111256094B (en) * | 2020-01-22 | 2022-09-23 | 广州市焦汇光电科技有限公司 | Optical device, optical system and optical curtain wall projection system |
JP7332983B2 (en) * | 2020-03-03 | 2023-08-24 | ウシオ電機株式会社 | Light source device |
CN117950256A (en) * | 2022-10-19 | 2024-04-30 | 苏州佳世达光电有限公司 | Projection device |
CN117676107B (en) * | 2024-01-31 | 2024-05-24 | 武汉中观自动化科技有限公司 | Image laser projection method and laser projection device |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150109584A1 (en) * | 2013-10-23 | 2015-04-23 | Ricoh Company, Ltd. | Light source device, and image projection apparatus employing light source device |
US20150316840A1 (en) * | 2012-12-26 | 2015-11-05 | Ricoh Company, Ltd. | Light source device and projector using the same |
US20160062221A1 (en) * | 2013-06-04 | 2016-03-03 | Nec Display Solutions, Ltd. | Illumination optical system and projector |
US20160077417A1 (en) * | 2013-06-07 | 2016-03-17 | Nec Display Solutions, Ltd. | Light source apparatus and projection display apparatus provided with same |
US20160131967A1 (en) * | 2013-06-04 | 2016-05-12 | Nec Display Solutions, Ltd. | Illumination optical system and projector |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011133782A (en) * | 2009-12-25 | 2011-07-07 | Casio Computer Co Ltd | Light source unit and projector |
JP2011191466A (en) | 2010-03-15 | 2011-09-29 | Panasonic Corp | Illumination device and projection type image display device |
JP5505719B2 (en) * | 2010-06-28 | 2014-05-28 | カシオ計算機株式会社 | Light source device and projector |
JP5609422B2 (en) * | 2010-08-24 | 2014-10-22 | セイコーエプソン株式会社 | Light source device and projector |
JP5895226B2 (en) * | 2010-11-30 | 2016-03-30 | パナソニックIpマネジメント株式会社 | Light source device and projection display device |
JP5783406B2 (en) | 2011-03-31 | 2015-09-24 | カシオ計算機株式会社 | Light source device and projector |
US8870383B2 (en) * | 2011-04-12 | 2014-10-28 | Panasonic Corporation | Incoherence device and optical apparatus using same |
JP2013044800A (en) * | 2011-08-22 | 2013-03-04 | Sony Corp | Illumination device and display device |
JP5950147B2 (en) * | 2011-09-20 | 2016-07-13 | カシオ計算機株式会社 | LIGHT SOURCE DEVICE, PROJECTOR, AND LIGHT SOURCE DEVICE MANUFACTURING METHOD |
JP6202661B2 (en) | 2011-09-28 | 2017-09-27 | カシオ計算機株式会社 | Light source device and projector |
TWI578651B (en) * | 2011-12-28 | 2017-04-11 | 日亞化學工業股份有限公司 | Light source apparatus |
JP2013145302A (en) * | 2012-01-13 | 2013-07-25 | Panasonic Corp | Laser light source and image display device |
CN102929086B (en) * | 2012-08-22 | 2015-02-25 | 深圳市绎立锐光科技开发有限公司 | Light emitting device and related projection system |
JP2014062951A (en) | 2012-09-20 | 2014-04-10 | Casio Comput Co Ltd | Light source device and projector |
JP6172494B2 (en) * | 2012-12-21 | 2017-08-02 | カシオ計算機株式会社 | Light source device and projector |
US9829775B2 (en) * | 2012-12-28 | 2017-11-28 | Nec Display Solutions, Ltd. | Semiconductor element cooling structure and electronic apparatus provided with same |
CN103901707B (en) * | 2012-12-28 | 2016-02-24 | 深圳市光峰光电技术有限公司 | Light-emitting device and relevant projecting system |
JP6283932B2 (en) * | 2013-01-28 | 2018-02-28 | パナソニックIpマネジメント株式会社 | Lighting device and video display device |
JP6815715B2 (en) * | 2014-08-29 | 2021-01-20 | 日亜化学工業株式会社 | Light source device and projector equipped with the light source device |
-
2014
- 2014-08-29 JP JP2014176354A patent/JP6815715B2/en active Active
-
2015
- 2015-08-27 EP EP15182693.0A patent/EP2990869B1/en active Active
- 2015-08-28 US US14/838,466 patent/US9456188B2/en active Active
- 2015-08-28 CN CN201510733223.3A patent/CN105388689A/en active Pending
- 2015-08-28 CN CN202111248656.1A patent/CN114035397B/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150316840A1 (en) * | 2012-12-26 | 2015-11-05 | Ricoh Company, Ltd. | Light source device and projector using the same |
US20160062221A1 (en) * | 2013-06-04 | 2016-03-03 | Nec Display Solutions, Ltd. | Illumination optical system and projector |
US20160131967A1 (en) * | 2013-06-04 | 2016-05-12 | Nec Display Solutions, Ltd. | Illumination optical system and projector |
US20160077417A1 (en) * | 2013-06-07 | 2016-03-17 | Nec Display Solutions, Ltd. | Light source apparatus and projection display apparatus provided with same |
US20150109584A1 (en) * | 2013-10-23 | 2015-04-23 | Ricoh Company, Ltd. | Light source device, and image projection apparatus employing light source device |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160091782A1 (en) * | 2014-09-30 | 2016-03-31 | Seiko Epson Corporation | Light source apparatus and projector |
US9964842B2 (en) * | 2014-09-30 | 2018-05-08 | Seiko Epson Corporation | Light source apparatus and projector |
US20160223891A1 (en) * | 2015-02-02 | 2016-08-04 | Nichia Corporation | Light source device and projector having the light source device |
US9946142B2 (en) * | 2015-02-02 | 2018-04-17 | Nichia Corporation | Light source device and projector having the light source device |
US20180210211A1 (en) * | 2017-01-26 | 2018-07-26 | Seiko Epson Corporation | Illuminator and projector |
US10209527B2 (en) * | 2017-01-26 | 2019-02-19 | Seiko Epson Corporation | Illuminator and projector |
US20190331992A1 (en) * | 2018-04-27 | 2019-10-31 | Panasonic Intellectual Property Management Co., Ltd. | Phosphor wheel, light source device, and projection display apparatus |
US11126072B2 (en) * | 2018-04-27 | 2021-09-21 | Panasonic Intellectual Property Management Co., Ltd. | Phosphor wheel including a light absorption processing body provided in a light processing region, light source device including the phosphor wheel, and projection display apparatus including the phosphor wheel |
US10845578B2 (en) | 2019-02-05 | 2020-11-24 | Panasonic Intellectual Property Management Co., Ltd. | Light source device and projection display apparatus |
Also Published As
Publication number | Publication date |
---|---|
US9456188B2 (en) | 2016-09-27 |
CN114035397A (en) | 2022-02-11 |
EP2990869B1 (en) | 2018-03-21 |
JP2016051072A (en) | 2016-04-11 |
JP6815715B2 (en) | 2021-01-20 |
EP2990869A1 (en) | 2016-03-02 |
CN105388689A (en) | 2016-03-09 |
CN114035397B (en) | 2024-06-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9456188B2 (en) | Light source apparatus and projector having light source apparatus | |
US9807355B2 (en) | Light source apparatus and projector having light source apparatus | |
US10429636B2 (en) | Illumination device and image display apparatus | |
US20160041457A1 (en) | Projector with wave length wheel and color wheel in one module | |
JP6459634B2 (en) | Light source device and projector provided with light source device | |
US9946142B2 (en) | Light source device and projector having the light source device | |
JP6507629B2 (en) | Light source device and projector provided with light source device | |
US20120327374A1 (en) | Illumination apparatus and projection display apparatus | |
US11168867B2 (en) | Lighting apparatus and projection-type image display apparatus | |
JP2018084757A (en) | Illumination apparatus and projector | |
US20150338727A1 (en) | Light source device | |
JP6187612B2 (en) | Light source device and projector provided with the light source device | |
TW201741585A (en) | Light source device and projection display device | |
KR20190010549A (en) | Light source device and projection display device | |
JP6358082B2 (en) | Light source device and projector provided with light source device | |
JP6940788B2 (en) | Light source device and projector equipped with the light source device | |
JP6680340B2 (en) | Light source device and image projection device |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: NICHIA CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:MIYATA, TADAAKI;MATSUO, HIDENORI;REEL/FRAME:036445/0197 Effective date: 20150826 |
|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1551); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 4 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 8TH YEAR, LARGE ENTITY (ORIGINAL EVENT CODE: M1552); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Year of fee payment: 8 |